Upright drilling-machine.



Patented 1an. I, |901.

H G. BARR. UPRIGHT DRILLING MACHINE.

(Application and Feb. 2o, 1999.)

(No Model.)

y #Wy vN0. 665,38l. Patntd lan. l, |90I.

' H. G. BARR.

UPRIGHT DRILLING MACHINE.

(Application Med vFeb. 20, 1899.)

3 Sheets-Sheet 2.

(N0 Model.)

IIIIH "HIM www @uuml TH: Nonnls PETERS co.. Pucn'mlmmov4 wAsNmsroN, n. c.

Patented lan. I, |901. H. 6. BARR. UPRIGHT DRILLING MAOHINE.

(Appumion med rep. 2o, 1899.)

3 Sheets-Sheet 3.

(No Nudel.)

Il l

NITEED STATES PATENT Frio-i1.

HENRY Gr. BARR, OF WORCESTER, MASSACHUSETTS.

UPRIGHT DRlLLlNG-NIACHINE.

sncmon'rronr forming para of Letters Patent No. 665,381, dated January 1, 1901-. Application filed February 20, 1899. Serial No. 706,117. (No model.)

To a/ZZ whom, t may concern:

Be it known that I, HENRY G. BARR, a citizen of the United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Upright Drilling- Machines, of which the following is a specification, accompanied by drawings, forming a part of the same, and in which- Figure 1 represents a side elevation of an upright drilling-machine embodying my invention. Fig. 2 is a top view of a portion of the machine, showing part of the post, the drill-spindle, and the belt-pulley journaled in the post coneentrically with the drill-spindle. Fig. 3 is a central sectional view of that portion of the machine shown in Fig. 2, the section being taken on line 3 3, Fig. 2. Fig. 4 is a sectional View of the belt-pulley and its journal-bearings as shown in Fig. 3, with the dierential gear contained in the belt-pulley shown in full and with the latching mechanism in a different position from that shown in Figs. 2 and 3. Fig. 5 is a central sectional view of the cone-pulley 47 and the dierential gear contained therein by which the vertical feed-shaft 48 is driven. Fig. 6 is a central sectional View of the clutch connection 49 between the shafts 48 and 50.

Similar reference letters refer to similar parts in the different views.

My present invention relates to the mechanism for imparting a rotary motion to the drill-spindle, whereby the speed of the drillspindle may be varied from a very fast to a very slow speed, and it further relates to the f feeding mechanism by which a longitudinal motion is imparted to the drill-spindle; and my invention consists in the construction and arrangement of parts, as hereinafter described, and set forth in the annexed claims.

Referring to the drawings, 1 denotes the base of an upright drilling-machine; 2, the post; 3, the table upon which the work is supported, and 4 a rotating drill-spindle held in Vertical bearings and driven, in the present instance, by a belt 5 from a pulley 6, rotating on a stud at the rear of the post.

The above-named portions of a drilling-machine are now in common use and embody no part of my present invention.

Journaled concentrically with the drill-spin'- dl'e is a belt-pulley 7, driven by the belt 5 and held between a pair of journal-bearings 8 and 9, having their axes in alinement. The belt'- pulley 7 consists of a web l0, provided on one side with a hub 11, journaled in the lower bearing 9, and on the opposite side having a flange 12, forming the face of the pulley. The open side of the pulley is closed by a circular disk 13, inserted within the edge of the [iange l2 and having on one side a hub 14, journaled in the upper bearing 8. Held from rotating within the hub 14 is the hub 15 of a gear 16', located immediately beneath the disk 13. The web 10 of the belt-pulley carries upon diametrically opposite sides studs 17 and 18, on which are journaled gears 19 and 20, provided with hubs 2l and 22, to which are attached gears 23 and 24. The gears 23 and 24 engage opposite sides of the gear 16, and the gears 19 and 2O engage opposite sides of a gear 25, provided with a long hub 26, which is journaled in the hub 11 of the belt-pulley.

The drill-spindle 4 is provided with a longitudinal groove 42, which is engaged by a spline 27, carried by the hub 26 of lthe gear 25, thereby causing the rotary motion of the gear 25 to be imparted to the drill-spindle and at the same time allow a longitudinal movement to the drill-spindle as it is actuated by the feeding mechanism.

The ange 12 is provided with an interior [iange 28, immediately beneath the edge of the disk 13, having four equidistant notches 29 to receive the tip 30 of a latch 31, pivoted at 32 in lugs 33, which project from the upper side of the disk 13. The disk 13 is slotted at 34 to allow the latch to drop down and engage one of the notches 29 in the belt-pulley, thereby locking the belt-pulley 7 and the disk 13 together, so that as the belt-pulley is rotated the disk 13 and gear 16 Will be carried with it. Projecting from the front side of the journal-bearing 8 are a pair of lugs 35, inclosing a space between the lugs and in the plane of the latch 31 and corresponding toits thickness, so that when the latch 3l is raised to a vertical position, as shown in Fig. 4, it Will be firmly held between the lugs 35 35, and thereby hold the disk 13 and gear 16 from rotation.

IOO

Attached to the framework is a bladespring 37, arranged to bear against a V- shaped projection 38 on the latch 31, so that the tension of the spring will serve to hold the latch in its raised position by pressing against the surface 39. The space within the hub 14 of the disk 13 and above the hub 15 of the gear 16 is filled by a sleeve 41, forming a bearing for the drill-spindle 4 and carrying a stud 427,which enters the longitudinal groove 4 of the drill-spindle, by which the sleeve 41 is rotated. The sleeve 41 is also provided with a circumferential groove 41a to receive the end of a stud 43, held in the hub 14 of the disk 13, by which the sleeve 41 is held from longitudinal movement, but at the saine time rotated with the drill-spindle. Vhen the latch 31 is in the position shown in Figs. 1 and 3, the disk 13 and gear 16 are locked to the revolving belt-pulley 7 and rotated with it, causing the drill-spindle to be driven directly by the belt-pulley and at the same speed, the intermediate gearing only serving to lock the drill-spindle 4 and beltpulley 7 together. Then the latch 31 is raised between the lugs 35 35, as shown in Fig. 4, the disk 13 and gear 16 are then locked in a fixed position and the gear 16 becomes a stationary gear around which the gears held upon the studs 17 and 18 are rotated by the rotation of the belt-pulley 7. The gears 16 and 25'are of different sizes, the gear16 having in the present instance twenty-five teeth and the gear 25 twenty-eight teeth, and the gears turning upon thc studs 17 and 18 correspondingly varyin size. The gears 23 and 24, engaging the gear 16, have in the present instance twenty-eight teeth each, and the gears 19 and 20, engaging the gear 25, have in the present instance twenty-live teeth. The rotation of the studs 17 and 18 around the stationary gear 16 will cause a slow rotary motion to be imparted to the gear 25 and connected drill-spindle 4. When it is desired to give a rapid movement to the drillspindle, thelatch 31 is thrown down into the slot 34 of the disk 13, with its tip 30 resting upon the interior ange 28,until the rotation of the pulley brings one of the notches 29 beneath the latch, when the tip 30 instantly enters the notch and locks the disk 13 and belt-pulley7 together, causing the drill-spindle to rotate with the belt-pulley. When power is transmitted to the drillspindle through the differential gearing contained in the belt-pulley 7, its motion is greatly reduced in speed, and power is applied upon opposite sides of its.center,and the pulley remains balanced by the studs 17 and 18 and the gears carried thereon.

The drill-spindle 4 has a spline connection with a gea-r25, carryinga pulley45, adapted to be connected by a belt with a cone-pulley 47, having an operative connection with a vertical feed-shaft 48, provided with a clutch connection 49, by which the shaft 48 is connected with a shaft 50, which carries a worm 51, engaging a worm-gear 52 on a horizontal shaft 53. The shaft 53 carries a pinion (not shown) engaging a rack 54 on a sleeve 55, held between collars 56 57 in the drill-spindle 4.

The employment of a vertical feed-shaft driven from the drill-spindle and having intermediate connecting mechanism between said vertical shaft and the drill-spindle, substantially as shown and described herein, is not new.

My presentinvention consists in the use of a system of differential gears within the conepulley 47 for the purpose of reducing the speed of the vertical feed-shaft 48 similar to that already described for driving the drillspindle. The system of differential gears contained in the cone-pulley 47 consists of studs 58 58, carried by the pulley, on which are journaled the attached gears 59 and 60 and the attached gears 61 and 62. The gears 59 and 61 engage a fixed gear 63, concentric with the shaft 48, and provided with a hub 64, held in a split box or bearing 65 on a bracket 66, which is bolted to the post 2. The gears 6l) and 62 engage a gear 67, concentric with the shaft 48 and having a hub 68, provided with a spline connection 68a with the shaft 48, thereby causing the rotary motion of the cone-pulley 47 to be communicated to the vertical shaft 48 with a greatly-reduced speed. The clutch 49 consists of a hollow cone 69, attached to the shaft 48 and having an interior conical friction-surface 69 fitting the exterior conical surface 70 of a cone 71, attached to the end of the shaft 50. The cone 69 is recessed to receive an annular disk 72, concentric with the cone 69 and attached thereto by screws 73 73. The shaft 50 is hollow and incloses a spindle 74, having a screwthread 75, projecting beyond the lower end of the shaft 50, and carrying a nut 76, provided with a hand-wheel 77. The upperend of the spindle 74 is provided with a head 78, inclosed in a chamber 79 and resting upon the upper surface of the annular disk 72. The spindle 74 carries a stud 80, which enters an interior groove 81 in the shaft 50, causing the spindle 74 to rotate with the shaft 50, but be capable of a longitudinal movement therein. Attached to the spindle 74 is a collar 82, bearing against the under side of lthe annular disk 72. The lower cone 71 is provided with a concentric recess 83, and between the collar 82 and a washer 84, resting upon the end of the shaft 50, is a spiral spring 85, which exerts a lifting force against the collar 82 to raise the feed-shaft 48 and its attached cone 69 out of contact with the cone 71 on the shaft 50, thereby breaking the connection between the shafts 48 and 50 and allowing the drillspindle to be fed by hand by the rotation of a hand-wheel 86, attached to the lower end of the shaft 50, which is held from longitudinal movement by the worm 51, inclosed between its journal-bearings 87 and 88.

lOO

IIO

estesi When it is desired to feed the drill-spindle by power, the nut 76 is screwed upon the end of the spindle '74, causing its head 78 to draw the cone 68 into operative contact with the cone 7l.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. In a drilling-machine, the combination with aframework having journal-bearings 8 and 9 in alinement with each other, of a pulley provided with a hub on one side journaled in one of said bearings, a disk concentric with said pulley and having a hub journaled in the other of said bearings, a gear provided with a hub inclosed in the hub of said disk and having a spline connection therewith, a gear having a hub inclosed in the hub of said pulley, a drill-spindle having` a spline connection with said gear-hub, differential gearing carried by said pulley and connecting said gears, and means for connecting said disk and pulley, substantially as described.

2. In a drilling-machine, the combination with a framework provided with jou rnal-bearings 8 and 9 in alinement, of a pulley provided with a hub journaled in one of said bearings, a gear inclosed in said pulley and having a hub journaled in the hub of said pulley, a drill-spindle inclosed in the hub of said gear and having a spline connection therewith, a disk concentric with the pulley and having a hub journaled in the other of said journal-bearings, a gear having a hub inclosed in the hub of said disk and havinga spline connection therewith, differential gearing between the two gears concentric with said drill-spindle and means for holding said disk and its attached gear from rotation, sub-` stantially as described.

3. In a drilling-machine, the combination with adrill-spindle, of gears 23 and 25 having hubs journaled in bearings concentric with said drill-spindle, a pulley journaled concentrically with said drill-spindle, differential gearing carried by said pulley and operatively connecting said gears 23 and 25, a disk 13 concentric with said drill-spindle and attached to the hub of said gear 23, a latch pivoted on said disk and adapted to engage said pulley, thereby connecting said pulley and said disk, or the Xed framework of the machine, thereby holding said disk and its attached gear from rotation, substantially as described.

4. In a drilling-machine, the combination with a framework and a rotating drill-spindle, of a beltp ulley concentric with said drillspindle, a gear having a spline connection with said drill-spindle, a gear journaled concentrically with said drill-spindle, dierential gears carried by said belt-pulley and operatively connecting said gear and the gear having a spline connection with said drillspindle, a notched flange carried by said pulley, a latch arranged to engage said notched ange and connect said pulley and said concentric gear, and lugs on the framework to engage said latch and hold said gear from rotation, substantially as described.

5. The combination of avertical drill-spindle, a belt-pulley journaled concentrically with said drill-spindle and having an interior flange provided with aseries of notches, a disk journaled concentrically with said drill-spindle, a latch carried by said disk and arranged to fall by gravity and engage said notches and thereby lock the belt-pulley and disk together, and means for operatively connecting said disk and said drill-spindle,substantially as described.

6. In a drilling-machine, comprising a rotating drill-spindle, the combination with said drill-spindle, of a feeding mechanism consisting of a belt-pulley on said drill-spindle, a driving-shaft parallel with said drill-spindle, a belt-pulley journaled concentrically with said shaft, differential gearing between said pulley and said shaft, a hollow shaft with its aXisin alinernent with said drivingshaft, a conical friction-clutch between said d riving-shaft and said hollow shaft, operative connecting mechanism between said hollow shaft and said drill-spindle, aspindleinclosed in said hollow shaft and having a swivel connection with one of the members of said clutch and a nut and attached hand-wheel on the outer end of said spindle and a spring by which the members of the clutch are separated, substantially as described.

Dated this 14th day of February, 1899.

HENRY G. BARR.

Witnesses:

RUFUs B. FowLnR, ELIZABETH GRAY. 

